Boring-tool.



E. GAIRING.

BORING TOOL.

APPLICATION FILED 0150.31. 1915.

L mfimr Patented Feb. 6,1917.

E M x Z EMIL animus, or CLEVELAND, OHIO.

BORING-TOOL.

Specification of Letters Patent.

Patented Feb. e, 191'".

v Application filed December 31,1915. Serial No. 69,546.

tion of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to boring tools and especially counterboring tools shown in the accompanying drawings and more, particularly pointed out-in the following specification and claims.

Oneobject of the invention is to provide means whereby a drill'may be securely held in its socket, not only when the tool is in operation, but against accidental release either while at rest or in operation; the con 'struction being such, however, that it may be readily removed when required.

Another object .of the invention is to provide means whereby the socket maybe manually held while the tool is being driven that the tool may be removed from a chuck, (not shown) or other driving means, while rotating, without risk of injurlng the operator or of dropping the tool.

Another object is to provide for a positive driving relation between the pilot rod employed and the counterboring tool, as it is well known that unless the pilot rod and the i boring tool operate as a single unit, it is. difit surrounds, 6%

ficult, if not impossible to insure the counterbore being concentric with the hole which Other advantages and improvements will hereafter appear."

7 I In the drawings accompanying this specification: Figure I ,is a longitudinal central section through thetool and its socket with parts in elevation: Fig. 2 is a side elevaof thepilot rod. -Fig. 4 is a longitudinal central section through the tool showing its fi -efiiofFig. 4. Fig. 7 is a cross-sectional *yiew. online .7"-7 of Fig. 1. Fig. 8 is a cross-sectional view on line 8-8 of Fig. 1.

Referring now to the letters of reference placed upon the drawings: A, denotes a socket provided with a tapering shank A, adapted to be inserted in a suitable chuck or other driving means (not shown.)

B, indicates a milled collar loosely sleeved upon the socket A.-

0, denotes a retaining ring to secure the milled. collar against lateral displacement, and 0, denotes a transverse pin to secure the ring to the socket.

D, designates a boring tool having a. shank D, cut away at its end to provide a flattened surface D adapted to sllde past a transverse pin E, supported in the wall 01 the socket A, upon entering the shank in the latter.

D denotes a groove formed in the shank D, opening into the flattened portion D to receive the transverse pin E.

A slight rotation between the boring tool and the socket in the direction in which the socket will be driven, will cause the transverse pin E, to enter the groove D thus locking the tool in its s'ocket.

lD indicates a circumferential groove in the shank of the tool, designed to receive the movable detent F, supported in the wall of the socket.

Gr, indicates a split resilient ring lodged in the groove formed in the periphery of the socket and also in a kerf in the detent F,

that the pilot rod and tool may be operated as a unit.

Having thus indicated the several parts by reference letters, the construction and operationof'the device will be readily understood. When it is desired to remove tool and socket from the driving chuck (not shown), the milled sleeve of the socket is grasped by the hand of the operator while releasing it from engagement with the driving chuck. It will thus be obvious that while the tool and socket are rotating the sleeve may be held byfthe operator and the tool and socket removed when the machine is still in Operation. To withdraw the tool from the socket,

following their removal from the driving chuck, the tool is manually given a slight reverse movement between the socket and the shank of the tool, whereupon the flattened portion D of the tool shank is caused to register with the transverse pin E, that it may he slid past the pin ;-'then upon slightly pulling the tool, the spring actuated detent F, is forced from its seat in the groove D,

and the tool 'is released. It will be obvious that when the shank of the tool is in the socket and being. driven, the transverse pin E, upon entering the recess D will securely lock the tool in the socket; but should the tool through accident or otherwise, be caused to ,move with reference to the socket 'in a direction opposite to that in which the machine is belng driven, the tool will not dropfrom the socket even though the flattened.

portion D may be in line with the transverse pin, as the spring actuated detent F,

- lodged in the groove D serves to hold the 'cular shank fitted to the socket member, a

short groove in the shank, a straight passage leading into said groove, a' pin on the socket member for engaging said groove and looking the tool in the socket member, said' -for operating said detent, the said detent and annular groove forming means for re-' taining the tool in the shank in the event of the first named locking means between the tool and the shank becoming disengaged.

2. In a device of the character described,

a socket member, a tool having a shank fitted to the socket member, means for looking the tool shank in the socket member upon rotation of the tool in the driven direction and unlocking said tool from said socket member upon rotation of the tool in'the backward or reverse direction, an annular groove in said shank, a detent on the socket for engaging said annular groove, a circular spring for operating said detent, said detent and annular groove forming means for retaining the tool in the shank in the event of the locking means between the tool shank and socket member becoming disengaged due to'the accidental turning of the tool in the socket in a backward direction.

In testimony whereof, I sign this specification in the presence of two witnesses. Y Y

EMIL GAIRING. 

